Fuse



H. H. BAKER.

FUSE.

APPLICATION FILED APR. 30, 1919.

1,421,376, Patented July 4,1922.

UNITED STATES HOWARD H. BAKER, OF BUFFALO, NEW YORK, ASSIGNOR TO UNITED STATES FUSE' PATENT orricu.

CORPORATION, OF BUFFALO, NEW YORK, A CORPORATION OF NEW YORK.

FUSE.

Specification of Letters Patent.

Patented July 4, 1922.

Application filed April 30, 1915. Serial No. 293,705.

T 0 all whom it may concern:

Be it known'that I, HOWARD H. BAKER, a citizen of the United States, residing in Buf' falo, in the county of Erie and State of New York, have invented new and useful Improvements in Fuses, of which the following is a specification.

This invention relates more particularly to that type of fuse which is known in the market as a ferrule fuse, although some of the features of novelty are also applicable to fuses of other types. 2

It is the object of this invention to produce a refillable fuse having improved means for detachably connecting the fuse link with the terminals of the fuse, also to provide means for protecting the interior of the fuse from charring when the fuse link blows out or melts and to provide improved means for detachably connecting the sections of the body or casing of the fuse and producing an electric connection between the terminals thereof with the ferrules surrounding the ends of the fuse body.

In the accompanying drawings:

Figure l is a longitudinal section of the preferred form of fuse embodying my improvements, the section being taken on line 1--l Fig. 2. Figure 2 is an end view of the same. Figure 3 is a side elevation of one section of the fuse body or casing and the parts associated therewith. Figure 4 is a cross section taken on line 4-4:, Fig. Figure 5 is a perspective view of one of the ferrules. Figures 6 and 7 are perspective views of the two sections of the fuse body or casing and the parts mounted thereon. Figure 8 is a similar view of the preferred form of fuse link for use in connection with my invention. Figure 9 is a perspective view of a pair of holding or clamping clips which are employed for detachably connecting the fuse link with the terminals of the fuse. Figure 10 is a fragmentary longitudinal. section taken on line 10-1() Fig. 2.

Similar characters of reference refer to like parts throughout the several views.

The body or enclosing casing of this fuse comprises two sections 10,11, which are arranged side by side and are connected with each other along a longitudinal joint between the same. Although these'body sections may be constructed of any suitable material, it is referable to employ for this purpose, bakeiite' which is a strong and durable and an eiiioient electric insulator and heat resistant. The opposing central parts of these body sections are provided with cavities 12, 13 which together form a chamber adapted to receive the inner parts of the fuse terminals, the fuse link and. the means for connecting the fuse link with these terminals. The extremities 14L of each fuse body are preferably made of semi-cylindrical form so that when the two body sections are placed side by side the 6X5 tremities of the body as a whole are of cylindrical form and may be connected with each other so that they are incapable of separating while in use by means of two ferrules 15 15 which are preferably constructed of cylin drical form of sheet metal.

011 opposite ends of the body are mounted the terminals which are connected by the fuselink within the chamber and. which serve as parts of the means for producing electric communication between the fuse and the con-. tacts of the fuse block with which the fuse is designed to co-operate. Each of these terminals preferably comprises two metal sections 16 1.7 which are preferably constructed in the form of plates and secured lengthwise to the inner (mposing sides of the corresponding end portions of one end of the body sec tions. These terminal sections may be secured to the respective body sections in any suitable manner for instance, by means of screws 18, 19 passing through these terminal sections and engaging with screw nuts 20, 21 embedded in the body sections, as shown in Fig. l. The terminal sections 17. 17 of one of the body sections are short and prefer-.

ably extend to the exterior of the body but not to interior thereof, while the terminal sections 16, 16 of the other body section are long and extend to the exterior as well as to the interior of the body. The inner end of each of these long terminal sections are provided with a pair of laterally projecting retaining lugs 22, 22 which are arranged transversely side by side but separated from each other by an interventing space.

Although the fuse link which is intended to connect the terminals of the fuse may be variously constructed, the same, as shown in the drawings, preferably comprises a central narrow fusing portion 23 and two enlarged end portions 2 1,2 1 and the same is constructed of flat metal of low fusibility. Those parts of the fuse link adjacent to the o posite ends of its narrow part are inserte be tween the two pairs of retaining lugs and the enlargements of the fuse link are provided with in *ardly facing shoulders '25 which engage with the outer sides of the retaining lugs, thereby holding the link both against lengthwise movement on the terminal sections 18 and also against lateral moveinentin adirection parallel with the plane thereof.

The fuse link may be firmly clamped to the terminals of the fuse in various ways. For instance, this may be accomplished by means of two U-sheped fastening clips "26, 26 each of which is constructed of spring metal and. adapted to engage one of its legs with the outer side of the fuse link adj acent to the retaining; lugs while the other leg engages with the outer side of the respective terminal. section, the engagement of this clip with this terminal section and the fuse link being wholly frictional and serving to reliably connect the fuse link with this terminal section, so as to produce a good electrical contact between the same. In order to further ensure proper engagement of the fuse link with the respective terminal section, that leg of each fastenine' clip which engages with the outer side of the fuse linlc is provided at its free end with n laterally lug 97 which engages at its outer end with the inner side of the adjacent section of the fuse body, as shown in Fig. 4;. lVhen therefore the two sections of the fuse b dy are coupled with each other by the ferrules, the bottom of the cavitv in the body section ll by ongaging with the lugs 27 operates to positively hold the respective anaiirt the fuse link and form a good metallic contact between the same and the terminal section J G The Home produced by the blowing out or melting of the central part of the fuse lint: is preferably confined to the central part o f the fusechamber by two prrtitions which are arranged within the chznnber between the central part of the fuse linl; and the l ,lininals. This preferably acconn lished by forming each of these partitions of two sections 35 36 which are constructed inte grally with the adjacent parts of the body sections and project trz'nisversely inward and, engage with each othe' and with opposite sides of the fuse linlq, the inirtilions bcin; notched. as shown at 37 to receive the link By this means the flame cannot reach the ore terior of the fuse and set fire to adjacent articles.

In order to prevent undue charrine' or accumulation of carbon or soot on the inner visurfeces of the cavities of the body sections which form, the chanil'ier between the same, the,bottoins of these cavities are pre erably provided with a lining 28 of asbestos or similarmatcrial, which lining is preferably afii ked-to these bodysections by placing the materiel for these linings in the molds by which the body sections are made so that when the plastic rnnterial for these bodiesis pressed into these molds the linings will become lirinly attached to the body sections so as to pii'actically form an integral part thereof and therefore require no separate fastening for retaining the 'illl'lt? in place,

I t its outer end each of the terminal sec tions is provided on opposite sides of its center with a pair of contact wine' or ja 29. 3 7 which extend circuinferentially in opposite directions These contact wings arc arran sred in dill'crent planes. the inner one 29 being nearer to the adjacent end of the body section and ihe other 3) outwardly from the respective end of the body section. When assemllling the body sections of the fuse having its terminal sections thus provided with contact wine's the outer contact wing 30 of one terminal section overhangs the inner contact wing: 99 of the companion terminal section, but is separated therefrom by an intervening space. This space re ceivcs a contact blade 31 which is arranged on the outer end of the adjacent ferrule. Two of such blades are arrangei'l on diametrically opposite sides of the ferrule one for engagement with each pair of inner and outer Wings 29 30 on the respective end of the fuse, thereby forming in effect, two hni fe switches whereby each ferrule is electrica y connected with one o l the ternih'ials of the fuse and the link mounted thereon. To order to secure the oreate t stability the inner ends of tl (7 two blade contacts of the ferrule are connected with each other as shown at 32 in Figs. 2 and 5.

lo the operation of coupling the two body sections and electrically connecting the ferrules with the terminals thereof each ferrule is first slipped lengthwise over the ctnrcsrnnuling semicircular ends of the body section; while its contact blades are out of line with the contact wings; of the terminal sections at this end of the fuse. and after the ferrule has been pushed inwardly so that its blade contacts are in line with. the gaps or spaces between the pairs of inner and outer contact wings. then :1 rotary move ment of the ferrule in the proper direction will cause its coulactbladesto move between the 'iairs of contact wings in the form o l knife switches and produce an electric connection between the ferrule and the fuse linlc. A reversal of the operation of these parts will serve to dismernbcr the fuse and permit of renewing the fuse link when the same is burned out.

For the purpose of still further increasinethe electrical, contact between the opposite ends of the fuse link and the terminal sections, the opposite ends of the fuse link 33, 3-3 each of which is clamped between the outer edge of one of the long terminal sections 16 and a laterally projecting clamping lip 34 formed on the outer end of the companion short terminal section 17, as shown 111 Fig. l.

As a whole this fuse is not only comparatively simple in construction and capable of being produced at low cost, but it also can be very quickly dismembered and assembled without the use of any special tools when it is necessary to replace the burned out fuse link.

I claim as my invention:

1. A fuse comprising a body having two body sections of insulating material which engage each other by a longitudinal joint between the same and which are provided on their opposing central parts with cavities forming a chamber, terminals mounted on the ends of said body and having parts arranged on the exterior and the interior of said body, a fuse link arranged within said chamber and engaging its opposite ends with the inner parts of said terminals, and clips for connecting said link with said terminals, each of said clips being of substantially U. form and engaging its legs with the outer sides of one end of said link and the corresponding terminal and that leg which engages with said link being provided with a laterally projecting lug which engages with the adjacent wall of said chamber.

2. A fuse comprising a body having two body sections of insulating material which engage each other by a longitudinal joint between the same and which are provided on their opposing central parts with cavities forming a chamber, terminals mounted on the ends'of said body and having parts arranged on the exterior and the interior of said body, the inner part of each terminal being provided with a pair of laterally projecting lugs, a fuse link arranged in said chamber and having its ends arranged between the pairs of lugs of said terminals and provided with enlargements forming inwardly facing shoulders which extend across the outer sides of said lugs, and means for connecting said link to said terminals.

3. A fuse comprising a body having two body sections of insulating material which engage each other by a longitudinal joint between the same and which are provided on their opposing central parts with cavities forming a chamber, terminals arranged at the ends of said body sections, each terminal projecting lip which overhangs the outer end of the companion terminal section, and a fuse link arranged between the two pairs of terminal sections and having its outer ends bent laterally and arranged between said lips and the opposing terminal sections.

4. A fuse comprising a body having two body sections of insulating material which engage each other by a longitudinal joint between the same and which are provided on their opposing central parts with cavities forming a chamber, terminals arranged at the ends of said body sections, each terminal including two sections which are secured to the inner opposing portions at one end of said body sections, and each terminal having the outer ends of each of its sections providedwith inner and outer contacts and ferrules arranged on opposite ends of said body sections and each provided with blades, engaging the inner and outer contacts of one of said terminals.

5. A fuse comprising a body having two body sections of insulating material which engage each other by a longitudinal. joint between the same and which are provided on their opposing central parts with cavities forming a chamber, terminals arranged at the ends of said body sections, each terminal including two sections which are secured to the inner opposing portions at one end of said body section and each terminal section being provided at its outer end on opposite sides of its center with inner and outer circumferential contact wings and ferrules arranged on opposite ends of said body sections and each provided on opposite sides of its outer end with transverse contact blades which are engaged between the contact wings of one terminal by a rotary movement of said ferrule relatively to said. body.

6. A fuse comprising a fuse link, a body having two sections of insulating material which engage each other by a longitudinal joint between the same, terminals which are arranged at opposite ends of said sections and are adapted to receive between them the link of the fuse, wings arranged on the ends of said sections, and ferrules slidable lengthwise on said sections and also rotatable therein into and out of engagement with said win gs HOWARD H. BAKER. 

